Safety-tread for stairs.



UNITED STATES Patented June 2, 1903.

PATENT OFFICE.

JAMES A. M O NAMEE, OF QAMBRIDGEPORT, MASSACHUSETTS.

SAFET Y-TREAD FOR STA] RS.

SPECIFICATION forming part of Letters Patent N 0. 730,145, dated June 2, 1903..

Application filed September 6, 1902. Serial ll'o. 122,299. (No modeL) To a, whom itmay concern:

Be it known that I, J AMES A. MONAMEE, a citizen of the United States, and-a resident of Cambridgeport in the county of MiddleseX and State of Massachusetts,11ave invented certain new and useful Improvements in Safety- Treads for Stairs, of which the following is a specification.

Thisinvention relates toa n improved safety tread for stairs made of concrete or plastic material; and it consists in embedding in the mass, while in a plastic state,,a series of bars of lead preferably arranged in parallel rows and having one of their sides or edgespr'ojecting through and even with the face of the stair-tread. The said lead-bars are firmly held in position in the mass of which the tread .is composed after such plastic mass has been allowed to set and harden By this means I produce a composite tread-surface composed in part of concrete and "in part of lead firmly embedded in the mass, the advantage of which is that it serves to prevent slipping on account of the exposed lead surfaces arranged intermediate the concrete mass, as will hereinafter be more fully shown and described, reference crete or other suitable plastic material A, into the face of which are embedded a series of preferably parallel lead bars B 13 while the mass is plastic. The said leadbars are preferably dovetailed in section as shown, so as to cause them to remain firmly held in position in the. mass after it is set and hardened.

' In makingv the stair-tread I prefer to make use of a mold composed of a bottom board 0 and inclosing walls D, preferably detachably attached to said bottom board.

In molding the tread I first place the lead bars 13 13' upon the bottom board 0 at suitable distances apart, as may be desired, after which I fill the mold with suitable plastic concrete or plastic material, causing thelead bars B B to be embedded in the (for the time being) under side of the molded tread. The plastic mass is then allowed to set and harden, caus ing the said lead bars to be firmly secured in theface portion of the tread. In this manner I produce an antislip frictional treadsurface of great durability and one which will wearevenly,so as to retain its composite frictional property for a great length of time. What I wish to secure by Letters Patent and claim is I 1 A composite stair-tread consisting of a rec tangular body of plastic material, and a series of leaden bars substantially wedge-shapedin cross-section andextending in said body, so their side and bottom faces will be engaged by the said material and their outer faces flush with the upper face of said body, said barswhen embedded in said material, extending parallel to one another'throughout their entire length, and said body of plastic materialandsaid bars when set up forming a stairtread-with its sides and bottomsurfaces constructed of plastic material and its top surface constructed of plastic material and the leadenbars, substantially as herein shown and described.

In testimony whereof I have affixed my signature in presence of two witnesses.

JAMES A. MoNAMEE.

\Vi-tness'es: i i '1 ALBAN ANDREN, DAVID H. OULLEN. 

